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低氧環境下PLGA/膠原纖維支架對小鼠骨髓間充質干細胞增殖及成肌腱分化影響

2020-12-31 07:27姜楊侯繼野張曉東徐桂清王玉沈雷吳雨軒
中外醫療 2020年31期
關鍵詞:間充質干細胞細胞增殖

姜楊 侯繼野 張曉東 徐桂清 王玉 沈雷 吳雨軒

[摘要] 目的 探討低氧環境下PLGA/膠原纖維支架對小鼠骨髓間充質干細胞(mBMSCs)增殖及成肌腱分化的影響。方法 利用靜電紡絲技術制作出30組PLGA/膠原纖維支架,正常條件下培養的mBMSCs為正常對照組;以3%O2,5%CO2,92%N2建立細胞低氧模型,在低氧環境下培養mBMSCs為低氧對照組,mBMSCs種植在PLGA/膠原纖維支架為低氧支架實驗組,各組均進行成肌腱分化誘導實驗14 d。CCK-8實驗檢測3 d、5 d、7 d各組mBMSCs增殖的吸光度值,ELISA實驗檢測各組mBMSCs上清液肌腱細胞標志性蛋白Tenomodulin和Scleraxis含量。結果 在3 d、5 d、7 d觀察點內,正常對照組、低氧對照組、低氧支架實驗組mBMSCs吸光度值差異有統計學意義(P<0.05),第3 d、5 d、7 d觀察點內,低氧對照組mBMSCs吸光度值均高于正常對照組,差異有統計學意義(P<0.01);與低氧對照組相比,低氧支架實驗組3 d、5 d、7 d吸光度A值均分別增高,差異有統計學意義(P<0.01)。在細胞低氧環境下,低氧支架實驗組Tenomodulin蛋白(4.526±0.002)μmol/L和Scleraxis蛋白(3.752±0.004)μmol/L含量高于低氧對照組Tenomodulin蛋白(2.831±0.023)μmol/L和Scleraxis蛋白(2.457±0.032)μmol/L,低氧對照組Tenomodulin蛋白(2.831±0.023)μmol/L和Scleraxis蛋白(2.457±0.032)μmol/L含量高于正常對照組Tenomodulin蛋白(1.542±0.071)μmol/L和Scleraxis蛋白(1.136±0.056)μmol/L,3組對比差異有統計學意義(P<0.01)。結論 低氧環境下PLGA/膠原纖維支架可有效促進mBMSCs增殖和成肌腱分化。

[關鍵詞] 細胞低氧;PLGA/膠原纖維支架;間充質干細胞;細胞增殖;成肌腱分化

[中圖分類號] R329 ? ? ? ? ?[文獻標識碼] A ? ? ? ? ?[文章編號] 1674-0742(2020)11(a)-0001-05

Effects of PLGA/collagen Fiber Scaffold on the Proliferation and Tendon Differentiation of Mouse Bone Marrow Mesenchymal Stem Cells under Hypoxia

JIANG Yang1, HOU Ji-ye2, ZHANG Xiao-dong1, XU Gui-qing1, WANG Yu1, SHEN Lei1, WU Yu-xuan3

1.School of Basic Medicine, Qiqihar Medical College, Qiqihar, Heilongjiang Province, 161006 China; 2.Department of Intervention, Qiqihar Jianhua Hospital, Qiqihar, Heilongjiang Province, 161006 China; 3.Department of Endocrinology, Third Affiliated Hospital of Qiqihar Medical College, Qiqihar, Heilongjiang Province, 161006 China

[Abstract] Objective To investigate the effect of PLGA/collagen fiber scaffold on the proliferation and tendon differentiation of mouse bone marrow mesenchymal stem cells (mBMSCs) under hypoxic environment. Methods Thirty groups of PLGA/collagen fiber scaffolds were fabricated by electrospinning technology. The mBMSCs cultured under normal conditions served as the normal control group; the hypoxia model of cells was established with 3% O2, 5% CO2, and 92% N2, under hypoxia environment cultivated mBMSCs served as the hypoxic control group, and mBMSCs planted on PLGA/collagen fiber scaffolds served as the hypoxic scaffold experimental group. Each group was subjected to tendon differentiation induction experiments for 14 d. CCK-8 experiment was used to detect the absorbance value of mBMSCs proliferation in each group on 3 d, 5 d, 7 d, and the content of Tenomodulin and Scleraxis in the supernatant of mBMSCs in each group was detected by ELISA. Results Within the observation points of 3, 5, and 7 d, the absorbance values of mBMSCs in the normal control group, hypoxia control group, and hypoxia stent experimental group were significantly different (P<0.05). On the 3rd, 5th, and 7th day, in the observation point, the absorbance values of mBMSCs in the hypoxic control group were all higher than those of the normal control group,the difference was statistically significant(P<0.01); compared with the hypoxic control group, the absorbance A values of the hypoxic stent experimental group were increased at 3, 5, and 7 d respectively,the difference was statistically significant(P<0.01). In the hypoxic environment, the contents of Tenomodulin protein (4.526±0.002) μmol/L and Scleraxis protein (3.752±0.004) μmol/L in the hypoxic stent experimental group were higher than those in the hypoxia control group Tenomodulin protein (2.831±0.023)μmol/L And Scleraxis protein (2.457±0.032)μmol/L, the hypoxic control group Tenomodulin protein (2.831±0.023)μmol/L and Scleraxis protein (2.457±0.032)μmol/L content were higher than the normal control group Tenomodulin protein (1.542±0.071)μmol/L and Scleraxis protein (1.136±0.056)μmol/L, the difference between the three groups was statistically significant (P<0.01). Conclusion The PLGA/collagen fiber scaffold can effectively promote the proliferation and tendon differentiation of mBMSCs under hypoxia.

綜上所述,在低氧環境下PLGA/膠原纖維支架材料與間充質干細胞有良好的相容性,支架材料促進間充質干細胞的增殖和分化,在體外實驗模擬機體微環境為肌腱損傷修復提供給一個有力的實驗依據。但在低氧環境下PLGA/膠原纖維支架材料促進間充質干細胞分化肌腱細胞生物化機制不明確,還需要深入研究探索,今后將研究低氧環境下詳細細胞信號通路,為干細胞組織工程加速修復損傷肌腱,為臨床上再生和修復肌腱奠定實驗研究基礎。

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(收稿日期:2020-08-01)

[基金項目] 齊齊哈爾醫學院院內科研基金項目(QY2016M-03)。

[作者簡介] 姜楊(1981-),女,碩士,講師,研究方向為組織工程肌組織與肌腱。

[通信作者] 沈雷(1975-),男,博士,教授,研究方向為組織工程肌組織與肌腱,E-mail:shenleiby@126.com。

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